No need to click on an a tag to see the equation, just hover on any <a> tag created using \eqref{label} and that's it!
Check https://mauriciopoppe.com/notes/mathematics/calculus/derivative/ for a live demo
- index.html (the configuration I use for MathJax which enables equation numbers, see http://cdn.mathjax.org/mathjax/latest/test/sample-eqnum.html for more examples) (MathJaxV2)